Paper-cutting machine



Patented May/1s, 18s-o.-

A. MALM. Paper-Cutting Machine.

(Model) section, embodyingmy invention. vertical cross-section thereof,and Flg. 3 a de- UNITED STATES PATENT OFFICE,

ALEXANDER MALM, OF BROOKLYN, NEW YORK.

PA-PE'R-CUTTI NG MACH INE.

SPECIFICATION forming part of Letters Patent No. 227,803,.dated May 18,1880.

` Application filed March10,1880. (Model.) y

To all whom t may concern:

Be it known that I, ALEXANDER MALM, a citizen of' the United States,residing at Brooklyn, in the county of Kings and State of New York, haveinvented new and useful Improvements in Paper-Cutting Machines, of whichthe following` is a specification.

Heretofore machines for cutting paper have had combined in them a tableadapted to be raised and lowered with respect to a reciproeating knife,said table being connected with a clamp by suitable gearing in such amanner that the table and the clamp were caused to move simultaneouslyytoward or from each other forA the purpose of clamping the material tobe cut or for releasing it when cut.

My invention consists in combining withl the movable clamp arrangedabove the movaable table of a paper-cutting machine a stationary knifewhich is located above the table and mechanism for elevating the tableand the paper thereon, said mechanism serving to elevate the table andthe material thereon without imparting any movement to the clamp untilthe table or material thereon comes in contact with the clamp,automatically causing the clamp to bear upon the material to be cut andto ascend with the table, during which latter operation the mechanismfor elevating thetable and the mechanism for operating the clamp actjointly on the table and clamp, thereby subjecting the paper to theaction of the stationary knife with the resistance offered by the paperto the action of the knife reacting on the clamp. With the partsenumerated are combined oblique guides, whereby thetable and clamp arecaused to move simultaneously in an inclined plane.

This invention is illustrated in the accompanying drawings, in whichFigure l shows a machine, partly in front view and partly in Fig. 2 is atail view.

Similar letters indicate corresponding parts.

In the example shown in the drawings the letter A designates themachine-frame, l5, the table; C, the clamp, and D the knife. The table Bis located between the sides of the machine-frame A, but is detachedtherefrom, and to the opposite ends of the table are attached slides ce, engaging vertical guide-bars f f, whichftogether with a cross-piece,G, constitute the clamp-frame. Bothy the clamp C and the cross-piece Gof its frame are fitted in vertical slots h It or h h inthemachine-frame, the clamp being located above the table and thecross-piece below the same. By the described arrangements of the. tableB and the clamp O they are both rendered movable.

The knife D is attached to a cross-head, I,

von the upper part of the machine-frame, so

that it is ystationary, and., like the clamp, is located above thetable.

In the normal positions of the parts the lower or bearing edge of theclamp O is'below the cutting-edge of the knife D, so that it' the tablemoves upward it or'the paper resting thereon strikes the clamp before'it is subjected to the action of the knife.

In connection with the table B and clamp C, I employa lifting mechanism,consisting of a rock-shaft, J, crank-arms k k, secured to the shaft,levers L L, having their fulcra on pivots n n in the clamp-frame, andlinks o o p p, whereby the levers connect with the crankarms and tablerespectively. The links o o connect both with the levers L L and thecrank-arms lala through a horizontal bar, q, hungin the levers and arms,as shown in Fig. 1, and the links p p connect with the table through theslides c e. The fulcra of the levers L L are at one end thereof, and thelinks o o connect therewith at the opposite end, while the links p p areconnected to an intermediate portion ofthe levers. Y

When the rock-shaft J is turned in the direction of the arrow shown inFig. 2 the levers L L are thereby swung in an upward direction -on theirpivots a n, and act on the table B to lift the same. The table rises onthe guiderods ff in the clamp-frame, and when the paper resting on thetable comes in contact with the clamp C the latter is thereby displacedand rises with the table, the paper being at the same time forced upagainst the cuttingedge of the knife D, so that the lifting mechanismacts on the table only until the clamp is brought into play, andthereafter acts jointly on the table and clamp. As the levers L L areswung upward they exert a downward pressure upon their fulcra a, andsince the lat- IOO ter are in the clamp-frame the levers have a tendencyto draw the frame downward, thereby tightening the clamp. Now, whenthe`paper meets with the edge of the knife D it offers a resistance tothe action thereof, and hence the work to be performed by the levers LL' is increased at that stage of the operation. This increased work ofthe levers L L causes an increased downward pressure thereof on theirfulcra n, and it follows that the resist ance offered by the paper tothe action of the knife reacts on the clamp.

In the end parts of the clamp U are oblique slots q q', whereby theclamp engages rollers r 9, arranged in the slots It h of themachineframe. These oblique slots q q', together with the rollers o" fr,form guides, whereby the table B and clamp G are caused to follow aninclined plane in their simultaneous movement, the result of which isthat the knife has a shearing action.

The mechanism herein described can also be applied to machines having amovable knife operated by a lever; but this feature forms thesubject-matter of a separate application for patent, and I do not,therefore, give a detailed description thereof herein.

What I claim as new, and desire to secure by Letters Patent, is-

l. The combination, in a paper-cutting machine, of a movable clamp and astationary knife arranged above a movable table with a liftingmechanism, such as described, for elevating the table independently ofthe clamp, and mechanism, such as described, for operating and causingthe clamp to bear upon the material to be cut by the material coming incontact with the clamp when the table and clamp ascend together, and theoperating mechanism jointly acts on the table and clamp, therebysubjecting the paper to the action of the knife, with the resistanceoffered by the paper to the action of the knife reacting on the clamp,as set forth.

2. The combination, in a paper-cutting machine, of a movable table, amovable clamp, and a stationary knife, both the clamp and knife beinglocated above the table, and alifting mechanism, substantially asdescribed, which acts on the table independently of the clamp until thepaper resting on the table comes in contact with the clamp, and whichthereafter acts jointly on the table and clamp, thereby subjecting thepaper to the action of the knife, with the resistance offered by thepaper to the action of the knife reacting on the clamp, and obliqueguides whereby the table and clamp are caused' to move simultaneously inan inclined plane, as set forth.

3. The combination, with the table B and clamp G, of the rock-shaft J,having the crankarms k 7c, levers L L, and links 0 o p17, sub stantiallyas and for the purpose described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing Witnesses.

ALEXANDER MALM. Witnesses:

CHAs. WAHLERS, E. F. KASTENHUBER.

